Efficient and environmentally friendly furnace slag treatment system and method

Abstract

The application discloses a high-efficiency environment-friendly furnace water slag treatment system and method. The system comprises at least two bottom filter pools, which are alternately in a water slag separation working state and a water slag transportation working state; a bottom filter material is arranged at the bottom of each bottom filter pool; the bottom filter material is filled in a material box to form a slope structure exceeding a water slag pile angle, so that the water slag pile is stored at the bottom of the slope; a track is arranged at the top of the bottom filter pool, and a bucket wheel reclaimer is arranged on the track and corresponds to the slope structure; the bucket wheel reclaimer moves along the track; and a control device controls the bucket wheel reclaimer to alternately work on the two bottom filter pools according to the detected water slag pile height of the two bottom filter pools. The application adopts a double-bottom filter pool structure, the bottom filter pools are alternately in a water slag separation working state and a water slag transportation working state, and the bucket wheel reclaimer always works on the bottom filter pool in the water slag transportation working state, so that the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to a high-efficiency and environmentally friendly furnace slag treatment system and method. Background Art

[0002] Bottom filtration has become the mainstream choice for blast furnace slag treatment due to its low operating cost. Figure 1 shown.

[0003] The process includes the following three steps:

[0004] 1) Slag flushing process: The slag produced by the blast furnace flows into the granulation tower through the slag ditch, and after being impacted and cooled by water flow, a slag-water mixture is formed.

[0005] 2) Slag-water separation process: The slag-water mixture flows into the bottom filter tank through the slag-water ditch. The bottom filter tank is equipped with graded flat cobblestone filter media to separate the slag and water. The water enters the pump room through pipes buried in the filter media. After cooling, it enters the granulation tower to flush the slag, forming a cycle.

[0006] 3) Slag Transfer Process: When the water level in the bottom filter tank drops below the filter material, the slag is transferred to an external transport facility using a grab crane (or other similar excavator, bucket elevator, etc.). Some steel mills install a movable cover above the bottom filter tank to keep the bottom filter tank sealed during non-slag transfer hours and prevent water mist from escaping. The movable cover must be opened during the slag transfer process.

[0007] The existing bottom filter water slag transport equipment has a low operating rate. The transport equipment uses grab buckets and excavators, and 30-40% of the time during the operation is idle, that is, the process of moving without water slag, which reduces the operating rate and places high requirements on the equipment's transport capacity.

[0008] With existing bottom slag filtration systems, the filter layer is laid horizontally and the bottom filter tank is relatively large. This requires that the transfer equipment be positioned in both the width (4-8m) and length (15-25m) of the bottom filter tank to effectively collect the slag. With the advancement of intelligent technology, programmable control of the transfer equipment is now possible to achieve automated slag collection. Furthermore, automated control increases the positioning of the slag transfer equipment (grab cranes, excavators, bucket elevators) and the buffer time for each sub-action, further reducing the slag transfer equipment's operating rate. Figure 2 This is a typical slag transport sequence of a grab crane, with the delay and position adjustment time in each stage accounting for 37%.

[0009] The current automatic bottom filtration method requires detection of the distribution of water residue in the filter tank, making it difficult to fully seal the bottom filter tank, which results in water mist dispersion. Low temperatures, saturated air, or a fully sealed process can affect the detection of water residue distribution. Summary of the Invention

[0010] In order to overcome the above-mentioned defects, the purpose of the present invention is to provide a high-efficiency and environmentally friendly furnace slag treatment system and method.

[0011] To achieve the above-mentioned objectives, the present invention provides an efficient and environmentally friendly slag treatment system, comprising: at least two bottom filter tanks, the bottom filter tanks being alternately in a slag separation working state and a slag transport working state; bottom filter material being provided at the bottom of each bottom filter tank; the bottom filter material being filled in a material box, forming a slope structure exceeding the slag pile corner, so that the slag is stored at the bottom of the slope;

[0012] A track is provided on the top of the bottom filter tank, and a bucket wheel reclaimer is provided on the track corresponding to the slope structure; the bucket wheel reclaimer moves along the track;

[0013] The control device controls the bucket wheel reclaimer to work alternately on the two bottom filter tanks according to the detected water slag pile heights in the two bottom filter tanks.

[0014] Furthermore, it also includes a granulation tower, a gas collecting hood is arranged above the bottom filter tank, and the upper chimney of the granulation tower is connected to the top of the bottom filter tank through a pipeline.

[0015] Furthermore, the slope structure is V-shaped or W-shaped.

[0016] To achieve the above-mentioned object, the efficient and environmentally friendly method for treating slag from furnace water of the present invention comprises the following steps:

[0017] The high-temperature molten slag discharged from the blast furnace is cooled in the granulation tower to release a large amount of water mist, which is discharged into the atmosphere through the chimney of the granulation tower; the resulting slag-water mixture flows into the bottom filter tank; there are at least two bottom filter tanks (5), and by detecting the height of the water slag pile, one is used for water slag separation and the other is used for water slag reversal, and the two processes are carried out alternately;

[0018] When the water-slag pile height in the bottom filter tank is lower than the required height, the water-slag separation process is carried out; the slag-water mixture flows into the bottom filter tank through the water-slag ditch; the water in the slag-water mixture passes through the W or V-shaped filter material with graded configuration, enters the pipeline and enters the water circulation system; the water slag in the slag-water mixture is retained on the pebbles and the filter box, and after being piled to a predetermined material level, it is transported by the bucket wheel reclaimer (4);

[0019] When the water level in the slag pool reaches the specified level, the reverse transportation process begins; the bucket wheel reclaimer enters the top of the bottom filter tank from the automatic parking position through the normally closed door left in the air collecting hood. After determining the slag storage height, the slag is collected by continuously pressing down the bucket wheel position and moving forward.

[0020] Furthermore, the water pumping pipe is in the form of a main pipe with many small holes or a main pipe + branch pipe with holes.

[0021] Furthermore, the bottom filter tank has a W-shaped filter material arrangement, and the bucket wheel reclaimer is a double bucket wheel type.

[0022] Furthermore, the bottom filter tank is arranged in a V-shaped filter material, and the bucket wheel reclaimer is a single bucket wheel type.

[0023] Furthermore, the filter box is made of a stainless steel plate, and an opening is provided on the stainless steel plate; an internal support is provided inside the stainless steel plate.

[0024] The present invention transforms the bottom filter tank and adopts a double bottom filter tank structure. The bottom filter tank is alternately in the water-slag separation working state and the water-slag transporting working state; and the bucket wheel reclaimer is always located on the bottom filter tank in the water-slag transporting working state to work, which greatly improves the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the bottom filtration water slag treatment facility in the existing technology.

[0026] Figure 2 Timing diagram of crane transporting slag in the prior art.

[0027] Figure 3 FIG. 1 is a structural diagram of an embodiment of the present invention.

[0028] Figure 4 for Figure 3 Schematic cross-sectional view of .

[0029] Figure 5 for Figure 4 An enlarged schematic diagram of point I.

[0030] Figure Number:

[0031] Granulation tower chimney (1), pipeline (2), gas collecting hood (3), bucket wheel reclaimer (4), bottom filter (5), pumping pipeline (6), pebbles (7) and filter box (8), flat pebbles (7), belt conveyor (9) DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] The water slag treatment system of the present invention comprises a water mist centralized discharge system, a water slag pile-shaped bottom filter tank system, a continuous water slag transport system, and the like.

[0037] The centralized water mist discharge system is designed to centrally discharge all water mist generated by slag flushing water exposed to air. This system includes the chimney above the granulation tower, the gas collection hood above the bottom filter, and the connecting pipes between them. It can be constructed of corrosion-resistant materials (e.g., fiberglass) or corrosion-resistant coatings with metal support structures to extend its service life.

[0038] The slag shape control bottom filter system primarily separates slag from water. It consists of a concrete tank, bottom filter media and a feed box, and pumping pipes. To control the slag shape and simplify slag storage distribution monitoring, the bottom filter media is sloped beyond the slag stack angle, allowing the slag to accumulate at the bottom of the slope and eliminating the need for the transport equipment to position the material across the width of the bottom filter. To prevent pebbles from collapsing the filter media, the sloped portion of the filter media is filled with a stainless steel feed box to maintain its shape and thus control the slag storage shape. The concrete tank and pumping pipes are arranged accordingly to match the filter layer distribution.

[0039] The continuous slag transfer system primarily transports accumulated slag via a bucket wheel, a high-angle belt conveyor, and a belt conveyor. The core equipment is the bucket wheel reclaimer. It moves along a track mounted on the top of the bottom filter tank wall, controlling the bucket wheel's position according to the level of slag in the bottom filter tank. This ensures continuous slag transfer, eliminating unnecessary idle periods that would reduce the equipment's reclaiming capacity. Due to the unique arrangement of the filter media in the bottom filter tank, the slag reclaimer does not need to move across the width of the bottom filter tank, saving positioning and buffering time and simplifying control requirements.

[0040] like Figure 1The embodiment shown includes two bottom filter tanks 5, which are alternately in a water-slag separation working state and a water-slag transport working state. Bottom filter material is provided at the bottom of each bottom filter tank. The bottom filter material is filled in a material box 8, forming a slope structure that exceeds the water-slag pile corner, so that the water-slag is stored at the bottom of the slope.

[0041] A track is provided on the top of the bottom filter tank, and a bucket wheel reclaimer 4 is provided on the track corresponding to the slope structure; the bucket wheel reclaimer moves along the track;

[0042] The control device controls the bucket wheel reclaimer to work alternately on the two bottom filter tanks according to the detected water slag pile heights in the two bottom filter tanks.

[0043] When work is required, the bucket wheel reclaimer (4) enters the top of the bottom filter tank (5) from the automatic parking position through the normally closed door left by the air collecting cover (3). The water slag storage height is determined by controlling the hydraulic system feedback of the bucket wheel, and the water slag is collected by continuously pressing the bucket wheel position and moving forward. The water slag continuously collapses toward the center during the continuous reduction process, preventing the bucket wheel reclaimer (4) from moving along the width direction of the bottom filter tank.

[0044] The gas collecting hood 3 above the bottom filter tank and the connecting pipe between the chimney on the top of the granulating tower and the gas collecting hood above the bottom filter tank are used to guide the centralized discharge of all the water mist formed by the slag flushing water exposed to the air.

[0045] The slope structure in the bottom filter can be designed according to the width of the bottom filter. If the width of the filter is large (>6m), a W-shaped filter material arrangement is selected, and the corresponding bucket wheel reclaimer (4) is designed as a double bucket wheel. If the width of the filter is small (≤6m), a V-shaped filter material arrangement is selected, and the corresponding bucket wheel reclaimer (4) is designed as a single bucket wheel. The filter box (8) adopts a stainless steel plate opening + internal support form, which can not only prevent the pebbles (7) from collapsing, but also realize the function of slight displacement of the filter material during the backwash process.

[0046] The slag flushing process includes the following steps:

[0047] 1. Slag flushing process: The high-temperature molten slag (temperature 1450-1550°C) discharged from the blast furnace is cooled in the granulation tower to release a large amount of water mist, which is discharged into the atmosphere through the granulation tower chimney (1); the slag-water mixture (temperature 70-95°C) is formed and flows into the bottom filter (5). There are at least two bottom filters (5), and one is used for water-slag separation and the other is used for water-slag reversal by detecting the water-slag pile height. The two processes are carried out alternately.

[0048] 2. Slag-water separation process: The slag-water separation process can only be carried out when the slag-water pile in the bottom filter tank (5) is lower than the required height. The slag-water mixture flows into the bottom filter tank (5) through the slag-water ditch. The water in the slag-water mixture passes through the W or V-shaped pebbles (7) and the filter box (8) with graded configuration and the flat pebbles filter material (7), and enters the pipeline and enters the water circulation system. The slag in the slag-water mixture is retained on the pebbles (7) and the filter box (8). After the pile reaches a certain material level, it is discharged by the bucket wheel reclaimer (4).

[0049] In order to increase the filtering speed, the water pumping pipe (6) is formed by opening a plurality of small holes in the main pipe or in the form of main pipe + branch pipe openings.

[0050] 3. Slag transfer process: The transfer process can only begin when the water level in the slag pool reaches the specified level. The bucket wheel reclaimer (4) automatically stops and enters the top of the bottom filter (5) through the normally closed door left by the air collecting hood (3). The hydraulic system feedback of the bucket wheel is used to determine the slag storage height. The bucket wheel position is continuously pressed down and moved forward to collect the slag. As the slag is continuously reduced, it collapses toward the center, preventing the bucket wheel reclaimer (4) from moving along the width of the bottom filter.

[0051] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments. Various modifications may be made within the scope of knowledge of those skilled in the art without departing from the spirit of the present invention. Many other changes and modifications that do not depart from the spirit and scope of the present invention should be considered within the scope of protection of the present invention.

[0052] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An efficient and environmentally friendly boiler slag treatment system, characterized in that: include: The method comprises at least two bottom filter tanks, which are alternately in a water-slag separation working state and a water-slag transport working state; bottom filter material is arranged at the bottom of each bottom filter tank; the bottom filter material is filled in a material box to form a slope structure exceeding the water-slag pile corner, so that the water-slag is stored at the bottom of the slope; A track is provided on the top of the bottom filter tank, and a bucket wheel reclaimer is provided on the track corresponding to the slope structure; the bucket wheel reclaimer moves along the track; The control device controls the bucket wheel reclaimer to work alternately on the two bottom filter tanks according to the detected water slag pile height in the two bottom filter tanks; It also includes a granulation tower, a gas collecting hood is arranged above the bottom filter tank, and the upper chimney of the granulation tower is connected to the top of the bottom filter tank through a pipeline; The slope structure is V-shaped or W-shaped.

2. An efficient and environmentally friendly method for treating slag from boiler water, characterized in that: The method comprises the following steps: The high-temperature molten slag discharged from the blast furnace is cooled in the granulation tower to release a large amount of water mist, which is discharged into the atmosphere through the chimney of the granulation tower; the slag-water mixture formed flows into the bottom filter tank; there are at least two bottom filter tanks (5), and by detecting the height of the water slag pile, one is used for water slag separation and the other is used for water slag reversal, and the two processes are carried out alternately; When the water-slag pile height in the bottom filter tank is lower than the required height, the water-slag separation process is carried out; the slag-water mixture flows into the bottom filter tank through the water-slag ditch; the water in the slag-water mixture passes through the W or V-shaped filter material with graded configuration, enters the pipeline and enters the water circulation system; the water slag in the slag-water mixture is retained on the pebbles and the filter box, and after being piled to a predetermined material level, it is transported by the bucket wheel reclaimer (4); When the water level in the slag pool reaches the specified level, the reverse transportation process begins; The bucket wheel reclaimer enters the top of the bottom filter tank from the automatic parking position through the normally closed door left in the air collecting hood. After determining the height of the slag storage, the slag is collected by continuously pressing down the bucket wheel position and moving forward.

3. The high-efficiency and environmentally friendly method for treating slag from furnace water as claimed in claim 2, characterized in that: The pumping pipe is in the form of a main pipe with many small holes or a main pipe + branch pipe with holes.

4. The high-efficiency and environmentally friendly method for treating slag from furnace water as claimed in claim 2, characterized in that: The bottom filter tank is a W-shaped filter material arrangement, and the bucket wheel reclaimer is a double bucket wheel type.

5. The high-efficiency and environmentally friendly method for treating slag from furnace water as claimed in claim 2, characterized in that: The bottom filter tank is arranged in a V-shaped filter material, and the bucket wheel reclaimer is in a single bucket wheel form.

6. The high-efficiency and environmentally friendly method for treating slag from furnace water as claimed in claim 2, characterized in that: The filter box is made of a stainless steel plate, on which openings are arranged; and an internal support is arranged inside the stainless steel plate.

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